The launch of NASA’s Mars Reconnaissance Orbiter was postponed for the second time Aug. 11 due to a combination of weather and technical problems, NASA announced.

The delay was called after engineers found a faulty reading in the hydrogen propellant loading system on the International Launch Services Atlas 5 launch vehicle and determined there was not enough time remaining in the launch window to perform a complete investigation.

The new launch window runs from 7:43 to 9:43 a.m. EDT Aug. 12.